how to resolve 'RTC is Reset,Bios setup Default has been loaded' error?

My computer sometimes boots up automatically and and shows this error, and if I press F1 my Grub loads.

if I turn it on my self then it doesn't give me this error.

the problem is sometimes it happens in the middle of the night or when i'm not Around, and while my computer is showing this error the CPU fan is running at 100%. i don't think that's good for hardware.

i'm only using Ubuntu so this can't be a Windows issue but if it's not an Ubuntu issue and has to do something with my hardware then please point me in the right direction and i'll ask my question there

Error Picture

2 Reset to default

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